[jira] [Created] (TS-2187) failed assert `nr == sizeof(uint64_t)` in EventNotify::signal()

["Yunkai Zhang (JIRA)" <ji...@apache.org>]

Yunkai Zhang created TS-2187:
--------------------------------

             Summary: failed assert `nr == sizeof(uint64_t)` in EventNotify::signal()
                 Key: TS-2187
                 URL: https://issues.apache.org/jira/browse/TS-2187
             Project: Traffic Server
          Issue Type: Bug
          Components: Core
            Reporter: Yunkai Zhang


I have noticed two bug report on "failed assert `nr == sizeof(uint64_t)`" in EventNotify::signal():

{code}
[TrafficServer] using root directory '/usr/local/trafficserver-4.1.0'
FATAL: EventNotify.cc:73: failed assert `nr == sizeof(uint64_t)`
/usr/local/trafficserver-4.1.0/bin/traffic_server - STACK TRACE:
/usr/local/trafficserver-4.1.0/lib/libtsutil.so.4(+0x14b57)[0x2b71a2d84b57]
/usr/local/trafficserver-4.1.0/lib/libtsutil.so.4(+0x13d7f)[0x2b71a2d83d7f]
/usr/local/trafficserver-4.1.0/lib/libtsutil.so.4(+0x1c32e)[0x2b71a2d8c32e]
/usr/local/trafficserver-4.1.0/bin/traffic_server(_ZN9LogObject15_checkout_writeEPmm+0x1f5)[0x5adf25]
/usr/local/trafficserver-4.1.0/bin/traffic_server(_ZN16LogObjectManager23check_buffer_expirationEl+0x7b)[0x5afbfb]
/usr/local/trafficserver-4.1.0/bin/traffic_server(_ZN3Log14periodic_tasksEl+0xe2)[0x595c92]
/usr/local/trafficserver-4.1.0/bin/traffic_server(_ZN3Log17flush_thread_mainEPv+0x28e)[0x596cee]
/usr/local/trafficserver-4.1.0/bin/traffic_server[0x59abcd]
/usr/local/trafficserver-4.1.0/bin/traffic_server(_ZN7EThread7executeEv+0x1159)[0x6ae139]
/usr/local/trafficserver-4.1.0/bin/traffic_server[0x6ab93a]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x6b50)[0x2b71a479cb50]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x2b71a5430a7d]
[E. Mgmt] log ==> [TrafficManager] using root directory '/usr/local/trafficserver-4.1.0'
[TrafficServer] using root directory '/usr/local/trafficserver-4.1.0'
{code}

In order to fix this issue, I cook a patch:
1) Using nonblock eventfd, so that we can tolerate write() failed with errno EAGANIN -- which is acceptable as the signal receiver will be notified eventually in this case.
2) After using nonblock eventfd, read() will not block in wait(). So I use epoll_wait() to implement block behavior, just like timedwait().

Please test this patch, any feedback is welcome.

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